Work-holder for cutter-grinding machines.



3. LEFEVRL worm morn Foii'qumR-emnomc MACHINES. APPLICATIDH FIE'EH INN. 2.19 18.

1 ,284, 721. Pa tentad No v. 12, 1918.

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JOSEPH LEEEVRE, F PAWTUCKET, RHODE ISLAND.

WORK-HOLDER FOR CUTTER-GRINDING MACHINES.

Specification of Letters Patent.

Patented Nov. 12, 1918.

Application filed January 2, 1%?18. Serial No. 210,002.

To all whom it may concern:

' Be it known-that I, JOSEPH Lnrnvnn, a citizen ,of the United States, residing at Pawtucket, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Work- Holders for Cutter-Grinding Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it apperta-ins to make and use the same.

My invention relates to that class of machines designed for grinding the rotary cutters of edge trimming machines used in the manufacture and repair of boots and shoes, the object being to provide a simple attachment for properly positioning the teeth of the cutters for grinding by the usual emery wheel or the like.

l/Vith the foregoing general object in View,

the invention resides in the novel featuresv of construction and unique combinations of parts to be hereinafter fully described and claimed, the descriptive matter being supplemented by the accompanying drawings which form a part of this specification and in which Figure 1 is a side elevation of a grinding machine equipped with the improved Work iolder;

Fig. 2 is an end elevation;

Fig. 3 is an enlarged top plan view showing the manner in which the cutter is held i1 operative relation with the grinding wheel;

Fig. 4 is an enlarged side elevation of the device detached.

Fig. 5 is a horizontalsectjon on substantially the plane indicated by the line 55 of Fig. 4;

Fig. 6 is a perspective view of the collar and the finger carried thereby; and

Fig. 7 is a sectional perspective view of the second finger and the means for attaching it to the collar.

In the drawing above briefly described, the numeral 1 designates the vertical standard of a common type ofmachine for grinding the cutters of edge trimmers, the grinding wheel 2 being mounted on a horizontal shaft 3 at the upper end of the standard. A shelf 4 is adjustably connected-at 5 to the standand 1 and upon the machines as now manufactured, this shelf supports the cutter 6, said shelf being provided with a vertical post 7 which centers the cutter. There is no means provided on theold machines, however, for insuring proper presentation of. the teeth of the cutter to the'driving wheel and thus some teeth are ground more than others, with the result that ragged work 1s produced by the cutters no matter how carefully they may be sharpened. To

overcome any such results, I employ the following construction.

A collar 8-is passed over the post 7 and rests on the shelf 4, a set screw or the like 9 being threaded through said collar for clamping it against rotation. end of collar 8 is formedwith a lateral lug 10 having an opening in which the lower end of a vertical finger 11 is secured by means of a screw 12 threaded in said lug.

Finger 11 is of substantially semi-circular shape in transverse section as shown in Figs.- 3 and 6 and is provided With one flat side.

.13 for contact with the rear faces of. the

successive teeth of the cutter as said cutter is turned after grinding of each tooth. An p0 additional and flat'finger 14 is disposed iii spaced parallel relation with the finger 11 and is located in a plane at an angle to line intersecting it and the center of the collar 8. Finger 14 is located in this manner so for receptionbetween the teeth of the cutter as shown in Fig. 3 and said finger thus prevents the cutter from being applied to the post 7 in an inverted position. 1

The lower end of the finger 14 is received 9 0 snugly in a U-shaped socket member 15 whose arms are clamped into tight contact with the sides of said finger by a suitable bolt or the like 16, said arms then extend ing in opposite directions from the finger and being curved for contact with the side of the collar 8. Each arm 17 is pro ided with a longitudinal slot 18 and screills 19 are passed through the slots into the collar. By this arrangement, the finger 14. may be adjusted toward and away from finger 11, according to the number andthickness of; teeth with which the cutter is provided. The upper end of finger 14 is preferably curved as indicated at 20 to facilitate its positioning between the teeth of the cutter.

In operation, the collar 8 is passed over the post 7 and secured against rotation by the set. screw 9 after first properly positioning the fingers 11 and 14 The cutter 6 is now passed over the post 7 and rests on thecollar as shown in Figs. 1, 2, and 3.

The upper 70 The fingers 1.1 and 14 are received between certain of the cutter teeth as will be clear from the last named figure and they thus hold an intermediate tooth in proper engagement with the grinding Wheel 2. After one tooth has been sharpened, the cutter is removed, turned to present the next tooth to the grinding wheel, and then again lowered into proper engagement With the fingers. This manner of operation insures that all of the cutter teeth shall be ground to the same extent, thus insuring smooth work from the newly sharpened cutter.

From the foregoing, taken in connection with the accompanying drawings, it will be obvious that although my invention is of extremely simple and inexpensive nature, it will. be highly eflicient and durable for the purpose intended. Furthermore, the device is applicable to numerous types of grinding machines.

Since probably the best results are obtained from the several specific details shown and described, these details are preferably employed, but I wish it understood that within the scope of the invention as claimed, numerous minor changes may Well be made.

I claim:

1. A Work holder for cutter chines comprising a collar to surround the cutter-holding post of the machine, means for holding said collar against rotation, a

grinding mafinger rising from said collar for reception between two teeth of the cutter to prevent rotation, a flat tooth-g1 iding finger parallel to the first named finger and disposed in a plane at an angle to a line intersecting it and the center of the collar, a socket member in which the lower end of said flat finger is secured, said member having oppositely extending curved arms contacting with the outer side of said collar, said arms having longitudinal slots, and screws passing through said slots and into said collar.

2. The combination with a grinding ma chine including a horizontal shelf, a post rising from said shelf, and a grinding wheel adjacent said post; of a collar surrounding said post and resting on said shelf, means for securing said collar against rotation, a finger rising rigidly from said collar and adapted for reception between two teeth of a cutter to prevent rotation of the latter, a second and flat finger rising from said collar and disposed in a plane at an angle to a line intersecting it and the center of said collar,

and means for adjusting said fiat finger toward and away from said first named finger. In testimony whereot I have hereunto set my hand in the presence of two subscribing Witnesses.

JOSEPH LEFEV 1E. lVitnesses James G. CONNOLLY, SABINA W. Wooo. 

